here is the response of the editor :
Ref.: Ms. No. PHYSB-D-15-00231
Progressively doping graphene with $Si$: from graphene to silicene, a numerical study
Physica B
Dear Dr. olivi,
Thank you for submitting your manuscript for publication in Physica B. Unfortunately, your paper is not attracting the interest of potential reviewers. Although many were invited to review your paper, none have yet responded. In view of the delay accumulated thus far, I am forced to reject your paper. This is by no means a judgment of merit, but indicates that your paper may be more appropriate in a different journal with suitable amendments, or require additional work to make it more appealing and interesting to the reviewers.
I am very sorry that I cannot accept your paper and I hope you understand my decision.
With best regards,
Leo Degiorgi
Editor
Physica B